Aquamarin Tauchservice is a PADI dive school and technical service center in Mossingen, Germany. Its Open Water Diver course runs as 5 theory units, 5 pool lessons and 4 open-water dives in a nearby lake, with a lighter "OWD light" option that finishes the open-water dives abroad via referral. The Advanced Open Water Diver course adds 5 practical dives (buoyancy, navigation, deep diving, night diving, search and recovery) up to 30 m depth. Beyond courses, Aquamarin runs a regulator and valve service workshop, an air filling station, dive computer battery changes, cylinder inspection (TUV), equipment rental and sales, plus day trips, weekend trips and group travel.